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(1³+2³+4³)-3/2 say this answer​

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( {1}^{3}  +  {2}^{3}  +  {4}^{3} ) -  \frac{3}{2}  \\  = (1 + 8 + 64) -  \frac{3}{2}  \\  = 73 -  \frac{3}{2}  \\  =  \frac{73 \times 2 - 3}{2}  \\  =  \frac{146 - 3}{2}  \\   = \frac{143}{2}\\ = 71.5

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